What would cells want to keep some particles in homeostasis and others in equilibrium?

cells need ATP to absorb nutrients into their semi permeable cell wall..or cytoplasm.

Explanation:

the cell can "so to speak" absorb the needed nutrients and block nutrients that are not needed. this is to enforce homeostasis, that the body stays within certain boundries... which is the definition of homeostasis..

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.